Geant4 Simulations of a Beam Shaping Assembly Design and Optimization for Thermal/Epithermal Neutrons

Avagyan, R.; Avetisyan, R. V.; Ivanyan, V.; Kerobyan, I.

doi:10.5506/aphyspolb.48.1693

Cited by 6 publications

(4 citation statements)

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“…Experimentally the results should be proven at A. Alikhanian National Science Laboratory, where the Cyclone 18/18 is installed. Compared with previous result [14], where the BSA consisted from 5-cm-thick Bi, 55-cm-thick Fe, 10-cm-thick Al, 5-cm-thick graphite and 10-cm-thick 7 LiF as moderators and 10-cm-thick Pb as reflector surrounding the moderation system, the total flux was 0.96 × 10 6 n/s/cm 2 from 6.24 × 10 14 proton/s and only 12% of neutrons were in the energetic range of up to 10 keV, while the rest were fast neutrons.…”

Section: Discussion and Resultsmentioning

confidence: 66%

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The possibility of an appropriate neutron beam achievement for medical purposes based on GEANT4 calculations

Ivanyan

2020

Eur. Phys. J. Plus

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Proton-induced reactions on the 9Be target are considered as a neutron source, and dependence of neutron yield on target thicknesses is investigated. The optimal thickness of the 9Be target with the design and optimization characteristics of a beam shaping assembly (BSA) for neutron flux from the thick target is studied with the GEANT4 program. To create the realistic model of the experiment, there are inserted two physics lists for nuclear and electromagnetic reactions. To get a high flux of neutrons had taken into account usage of special materials as moderators on the base of (n, 2n) nuclear reactions, as well as, moderators which will decrease the energy of neutrons to achieve the appropriate thermal/epithermal neutron flux. The creation of the system, which must be made from reflectors and moderators, is a necessity to explore the possibility of an appropriate neutron flux achievement for medical purposes, especially for boron neutron capture therapy (BNCT). GEANT4 simulations of this scientific paper describe the study of IBA’s C18/18 cyclotron-based neutron sources and its possible usage for therapies.

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Section: Discussion and Resultsmentioning

confidence: 66%

“…The 9 Be(p, xn) multiparticle reactions with thresholds less than 14.8 MeV are listed in Table 1. Figure 1 is a GEANT4 calculation result [14], performed to estimate the optimal and effective thickness of the target. Figure 1a presents neutron energy spectra for different thicknesses Fig.…”

Section: Creation Of the Geant4 Modelmentioning

confidence: 99%

The possibility of an appropriate neutron beam achievement for medical purposes based on GEANT4 calculations

Ivanyan

2020

Eur. Phys. J. Plus

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“…The intensity of protons in the vicinity of beryllium target is 10 4 p/cm 2 .s. New protons in the neighborhood of the target and moderator are resulted from 9 Be(p,xn) reactions [14]. The protons surrounding the collimator come from interactions of fast neutrons with hydrogen atoms of borated polyethylene material through elastic scattering reaction [15].…”

Section: Methodsmentioning

confidence: 99%

Analysis of Particle Distribution in a Double Layer Beam Shaping Assembly Resulted From 30 Mev-Proton Reactions With Beryllium Target Using the Phits Program

et al. 2020

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An analysis on the distribution of particle flux emanating from reactions of 30 MeV-proton with beryllium target in a double layer beam shaping assembly (BSA) has been carried out using the PHITS program. It studies important parameters relating to the distribution of proton, neutron, and gamma. It is revealed that reactions of proton and beryllium in double layer BSA produce fast neutrons and other protons, resulting from certain reactions, and recoil protons from the interactions of fast neutrons and hydrogen atoms. Fast neutrons are distributed around beryllium target, moderator, reflector, and collimator. They are moderated by Al and LiF material. Epithermal neutrons spread along the moderator, with a distribution that is tapering down as it approaches the end of the collimator (aperture). During its travel along the moderator, an epithermal neutron decreases in energy to become a thermal neutron. The spectrum of neutron beam produced by the double layer BSA is wide, which indicates that the neutron beam exiting the aperture consists of three kinds of neutrons, dominated by epithermal neutronswith energy range 1 eV – 10 keV.

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“…One part of the cyclotron that is still in development is Beam Shaping Assembly (BSA). The BSA is a system that transforms fast neutrons into epithermal neutrons while also suppresses ensuing contaminants (Avagyan et al, 2017;Monshizadeh et al, 2015). BSA designs used in neutron sources typically consist of a moderator, filter, reflector, and collimator as their main components (Kasesaz et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Thermal Neutron Flux Distribution in a Phantom Irradiated by Epithermal Neutron Beam from Double Layer Beam Shaping Assembly (DBSA)

odin

Suparta

Hermanto

et al. 2019

Pak. j. sci. ind. res. Ser. A: phys. sci.

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A simulation study on the Double-layer Beam Shaping Assembly (DBSA) system has been carried out. This study used fast neutron beam resulting from reactions of 30 MeV protons with beryllium target. The MCNPX code was utilized to design the DBSA and the phantom as well as to calculate neutron flux on the phantom. The distribution of epithermal neutron flux and gamma in the DBSA and phantom were computed using the PHITS code. The spectrum of radiation beams generated by the DBSA shows the characteristics that the typical epithermal neutron flux of 1.0 x109 n/(cm2.s), the ratio of epithermal to the thermal and fast neutron flux of 344 and 85, respectively and the ratio of gamma dose to the epithermal neutron flux of 1.82 x 10-13 Gy.cm2. The test of epithermal neutron beams irradiation on the water phantom shows that epithermal neutrons are thermalized and penetrate the phantom up to 12 cm in depth. The maximum value of neutron flux is 1.1 x 109 n/(cm2.s) at a depth of 2 cm in phantom.

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Geant4 Simulations of a Beam Shaping Assembly Design and Optimization for Thermal/Epithermal Neutrons

Cited by 6 publications

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The possibility of an appropriate neutron beam achievement for medical purposes based on GEANT4 calculations

The possibility of an appropriate neutron beam achievement for medical purposes based on GEANT4 calculations

Analysis of Particle Distribution in a Double Layer Beam Shaping Assembly Resulted From 30 Mev-Proton Reactions With Beryllium Target Using the Phits Program

Characteristics of Thermal Neutron Flux Distribution in a Phantom Irradiated by Epithermal Neutron Beam from Double Layer Beam Shaping Assembly (DBSA)

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